[Unity][BugFix][Op] fix error when calling full_like in masked_fill

[sbwww]

using python api of full_like instead of _ffi_api.full_like to solve the issue of missing dtype argument.
See also mlc-ai/relax/pull/279

[tvm-bot]

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• cc @quic-sanirudh _{See #10317 for details}

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